A&Q about 350Z
Q:
What kind of components for vtec engines increase factory horsepower the greatest but that are relatively affordable?
A:
intake is where most honda engines, especially ones not tuned for performance from the factory can generally see the biggest improvements.
A:
Amen to that. For what you pay, a homemade intake is going to bring the biggest increase, and it's easy as hell.
A:
Turbo, you can piece out a junkyard turbo for around $500. Seeing that you have a prelude, that should put you over 200whp.
is a great source of information on cheap turbos.